operation!
CREATING
A
DISPLAY
The addition
of the GPIB
unit
enabies
a
display to be
created
to
>our
own
requirements.
To
make
this
as
easy
as
possible,
the
instrument is
programmed
with a
number of specialized
screen
commands as
well
as
having a
comprehensive
character
set
stored
in
memory.
Screen commands
The operations involved in creating
a
display
are:
firstly
to clear
the
current display: secondly to
show
the user-configured display
with
the
selected
measurements
appearing
when and
where
required; thirdly to return to measurement mode.
The
following commands
are used
for
these
purposes:-
CS—
'Clear Screen;
This clears the screen but
allows measurement
results to be
displayed.
DS—Disable
Screen
output;
Stops
measurements
from being
displayed
on
the
screen,
ES-~ Enable Screen
output: Enables measurement
results to be
written on
the screen.
HO--Hold Display:
Used to halt
instrument
operation,
RS““Hestore Screen:
Returns
display
to
measurement
mode.
The
above
commands
may
be used
to operate
the
instrument
in
two
modes; one
in
which
the
instrument is halted:
and one in
which
the
instrumenrrs
still
running.
Instrument halted e.xample;
COMMANDS
"HD
ICS"
-WR
"
"BX
"
"SK
—
"
i
"RS"
COMMENTS
(
1 )
Keyboard
GPIB
commands are
ignored.
(2)
Readings
held are those at
time of "HD".
Instrument running
c.xampic:
COMMANDS
"CSDS"
-ES.VVR
"<.LF>"OS"
I
"ES.BX
OS"
?
COMMENTS
i !
)
Kev
board
GPI
B
cummanu.'' arc
responded to.
(
2)
New
readings arc
valid
and
readable.
Printing
on the
screen
To
print on the
screen
the
BX and
WR
commands
arc
used.
8X (BoX) command
This command is
used
to
position
and define
the boxes
(
nrrowv)
on
the
screen
pointing to
the mode
keys.
The command
has
the
form
BX n.m
where
n
=
box
pattern
and
m
=
length
of
box.
/\ display
e.xample i.^
.shown
in
Fig.
3-16,
Box panem
{n}:
The
boxes
appear
in
fixed positions on
the
screen
against the 8
mode
keys.
These
positions
are
binary
coded
—
1 for
a
box.
0 for
no box
—
'and arc
binary
weighted from top
to
bottom.
Forc.xampic, lor
boxes
to
appear next
to the
DUPLEX. B.AR CHART and HOLD
DISPLAY
keys
then n
=
binary
(HO
H) UK), w
hich
{
reading convenuonaliy
from nunc to
left
)
=
84.
Length
of box
(m);
This
is
the number
of
characters
in the
box
to a
maximum
of
31.
To
produce
the
box to
take
'PRESS
WHEN READY* then m
—
16
(spaces
included),
[f
boxes
of
different
lengths
are required,
sequential
BX
commands
must be sent.
3-52
46aS1-622N
Apr.
S8
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